Electric heating unit.



PATENTED SEPT, l? 'i966 E. H. RICHARDSON, ELECTRIC HEATING UNIT.

APPLGATION FILED DEGA19,1905.

laundryiron.

EAEL H. RICHARDSON. OF ONTARIO, CALIFORNIA, ASSIGNOR 'l`O PACIFIC ELECTRIC HEATING COMPANY. PORATION OF CALIFORNIA.

OF LOS ANGELES,

CALIFORNIA, A COR- ELECTRIC HEATING UNIT.

Specification of Letters Patent.

Patented Sept. 18, 1906.

Application Bled December 19, 1905. Serial No. 222.409.

To /L/fl whom, if 11i/ary concern:

' Beit known that I, EARL H. RICHARDSON, a citizen of the United States, residing at Ontario, in the county of San Bernardino 4and 'State of California, have invented a new and The present invention I consider as anims.

rovemerrt over the specific construction shown in a former application of mine on electric laundry-irons, filed April 25, 1905, Serial No. 257,386, and while in the present case I have shown and described the heating unit as applied to an electric laundry-iron I do not limit myself solely to such employment, for the unit is of equal value in electric stoves, other heating implements, or devices.

Another object is terminals. v T heaccompanying drawingsillustrate the invention.

Referring to the drawings, Figure 1 is a plan view of an electric laundry-iron constructed in accordance with my invention, thentop plate being removed. Fig. 2 is a vertical section of'the laundry-iron, taken through one of the terminals, and illustrates an improved construction for supporting the terminal. Fig. 3 is a view similar to Fig. l on aislightly-reduced scale, showing sliyhtlyinodied form of construction. .@Ifg ris a section on line a." x4, Fig. 3.- Fig` 5 isa side elevation ofthe ig. 6l is a perspective view showing the'construction of the core and its metal portions winding, a portion of the insulating material being broken away, with some of the wire removed.

The body of the iron 1 is substantially hol-v low, having a triangular central cored-out ortion 2 with side cored portions 3, leaving a solid-metal portion in the toe 4 and solid- 5 in cach corner of the heel. In the forni shown in Fig. 3 the bodv of the iron is provided with two channels which are toy provide a simpler' method of constructing the support for'the to -insulate its four faces.

and handle of the laundry-ironv preferably machined out to give even smooth surfaces on their inner walls, which channels terminate in the solid-heel corner portions 5, the channels converging toward the toe, with their front ends very close together and terminating in the toc portion 4. Arranged within each channel is a heating u nit which comprises a core 6, which is rectangular in cross-section. The respective ends of the core lie within the corner prtixgns A5 of the body and the toe portion 4 o'ftlie body, and each end 7 .is of a width which. snugly fits in the channel, so that as perfect a contact as ossible is formed between the solid metal of the body and theendsof the core. In order to allow Ifor the expansion of the cores when heated, as it is preferred to constructthe body' of iron and the cores cores are made slightly shorter than the length of the channels, as clearly shown in Fig. 3, leaving spaces S at each end of the core. The intermediate portion of' each core for a distance extending from a solid portion 5; to, the toe portionl4 is made-smaller' in cross-section than thc ends 7, as clearly shown in Figs. 3, 4, 'and 6.

In assembling the 1thersinall elongatedv `ntermediate portion of each core is wrapped vwith a sheet of mica. 9 fire l0 is then Wound over the mica, with the coils spaced slightly apart, as shown in Fig. 6, to prevent short-.circuiting between thecore of the wire. The wire is then Ycovered on three sides of the core-i. e., the bottom and side faces-with another sheet of .mica 11, and when the outer sheet 11 is in place, owing to the slight curlvature ofthe coils of thewire, it is bulged slightly wider thanithe width of the end po rtions 7. The core thus `prepared is slipped. into its channel, which flattens the coils of wire, so that the mica sheet 11 can'lie flush with the facesvof lthe end portions 7, thus forming a snug fit, giving va flat. Contact bel tween the mica 1 1' at all points with the walls of the channel. It should be understood, zoo

that no great pressure is thus secured between the walls of the channel and the mica Asheet 11, but merely a close even contact, of the heatV amply sufficient to conduct all desired to the side walls of the channel and .to the sole of the iron which forms the bottom of the channel.

The walls of the channel are provided near' lof copper, the

heating unit in the iron IOS each end with slot-5.12,. whichop"v n intovtlie f' wire'woiinfd core central cored-out portion 2, and the forward ends of the wires are carried from the cores .out through the slots )Zend connected to-;

Thev rear ends oft the gcther,` as shown.` Wires are likewise brought through the rear slots 12 and connected to respective terminels 13. sheet of mica 14cis' placed over l. the entire lower portion'ofthe iron, as shown in Fig.- 4, which covers the top of the core. Above the mica 14 a thick sheet of and upon the sheet of asbestos i -reststhe coverv 16, which is fastened to the body vof the y iron yby two screws-17 at each 'corner of the heel and by a screw atthe toe. The bail 18 of the handle 19 is' screwed to the cover 16,' there being an intervening'strip of asbestos 2O to prevent the cover from heating the handle.' 2

r lnwthe forni shown in Fig. 1` the 'construction is similar to the foregoing 'except' ythat, the channels which receive the cores extend having open ends whichenabl'esthe 'ends ol the cores tobe extended clear to the enter side faces of the body of the iron, so that a greater area of conta-ctis secured betweenl the ends of the cores and the body.' The front ends of the cores are finished oif to conform to the curve oi' the toe of the iron, while the rear ends ofthe cores are Afinished obliqnely 'to lie yflush with the heel of the iron.

Fig. 2 shows the preferred construction oi" the method of lattaching thetermina'l, the heel of the iron having a central 'hole'21 and is counterbored on its outer face to receive a mica Washer 22. The mica washer is ydrilled concentrically with the hole Zlin thehcel of the iron and. has a smalier hole than the perforation 21, through/which terminal bolty 23 passes, the mice. Washer 22 serving to hold the bolt 23 concentric With.the perforation 2l to prevent lateral displacement of the bolt and short-circuiting withy the body of the iron. On the inner and outer sides of the heel mica'washcrs 24.- erc also are squeezed up tight when secured in place by its nuts.

What l claim isl. An electric heating unit comprising a body with ej channel uniform width, a core 1n said channel with a contracted intermediate portion, Wire wound on the intermediate portion, means for preventing short-circuiting of-the wire, the wirewound core' thus formed having a'subst'anf' tially uniform width and filling the channel laterally. A l 2. An electric heating unit vembracing a wire-won1id core with protruding unwonnd ends and having a' substantially uniform width throughout its length.

3.l An electric heating unit embracing a i' After the cores are in place s broad asbestos 15 is laid,I

l throughout its length.` y. .A

41. Anelectric heating unit embrain'g a wire-wofmd core with unwound ends and'xhaxffv ing' a substantially Vuniform width and thickJ ness throughout its length. v v"5'fAn electric heating unit comprising a body with a hollow central portion and formed with channels onf both'sides of the Yhollow ortiornand Wire-wound cores the chane s, each wire-wound core making' contact substantially throughout its length with the walls of the ,channel whereby the said channelvvwalls conduct heatto 'the extremities ofthe body'.l I

6.A An'electric heating unit comprising a' bodywith a' hollow central portion and formed with channels on fboth sides of the h'ollow portion, and ,having hollow portions y on eachlouterside ofthe channels, and .wirewound cores in the channels, each wire-wound core making contact substantially throughout its length with the wells of the channel whereby the said channel-walls conductheat to the extremities `of the body. y

7. An electric heating unit comprising a provided, which the terminal 'is having a substantiallyv ybody with a hollow central portion and formed' with' channels on both sides of the holiow portion, and wire-Wound cores in the channels, each wire-wound core making conta'ct substantially throughout its length with :with ii'nwnnd endsandlsA having e substantially uniform thickness 'the walls of the channel' whereby the said channel-walls conduct heat to 'the extremi-v ties ofthe body, suitable terminals on the bodyLthe said channel-Walls having slots though which the wires pass to tne termina s.

8.' An electric heating unit comprising a body with a channel, and .aWire-wound core in the channel making contact substantially throughout its length with the walls of the channel whereby the saidl channel-walls conduct heat to' the extremities ofthe body.

9.' An electric heating'unit comprising a body `with a channel which "extends completely throrgh the body', and a wire-wound Gorein the channel and extending the entire vlength ofthe channelf l .'10. An electric heating unit comprising a I"body with e channel which extends completely throrgh the body, and a wire-Wound 'cere in the channel and extending the entire length 'of the' channeljthe ends of the core losing sbstantially ii.:sh with the ends of the iody.

' In testimony whereof I have hereunto set my hand,at Los Angeles, California, this 5th day of Becember, 1905.

EARL H. RICHARDSON.

' In presence ot-n Lfinances ""W. HAoKLnY,

'vinnenr A. TALBERT.

TOO

IIO 

